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Macular sparing control method and control system for ophthalmic laser treatment device

a control method and laser treatment technology, applied in the field of ophthalmic laser treatment equipment, can solve the problems of serious damage to visual function, difficulty in operation, irreversible functional injury, etc., and achieve the effect of avoiding damage to the macular area, avoiding damage to the retina, and improving the laser treatment

Inactive Publication Date: 2016-03-17
ZHOU DAOYU +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a method to protect the macular area, the most sensitive part of vision, during ophthalmic laser treatment. The method automatically controls the laser treatment device to stop it when the laser spot irradiates onto the macular area and to start it when the laser spot moves away from it. This control system increases the efficiency and safety of the treatment, allowing surgeon to concentrate on the treatment without worrying about the safety concerns. The method also improves the recognition rate, sampling matching algorithms, and pre-warning area, increasing the reliability of the system. The present invention also suggests improvements in laser type and parameterized treatment mode to enhance the safety of the operation.

Problems solved by technology

As the most sensitive part of vision, damage to macula lutea will cause irreversible functional injury.
Laser is a highly effect treatment for fundus diseases, but the macular area is a restricted zone of laser treatment because it will cause serious damage to visual function if the macular area is accidentally damaged by laser.
But the difficulty of operation will be quite high when some of the affected parts are very near to the macular area.
If a surgeon operates conservatively, he may leave affected parts uncured, if a surgeon operates boldly, he may accidentally damage the macular area.

Method used

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  • Macular sparing control method and control system for ophthalmic laser treatment device
  • Macular sparing control method and control system for ophthalmic laser treatment device
  • Macular sparing control method and control system for ophthalmic laser treatment device

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0058]A camera collects a fundus image, recognize a macular area after analytic processing. When the laser spot irradiates onto the said area during operation, the laser treatment device will be triggered to enter a standby status automatically, so that the laser can't be excitated, damage to macula lutea is prevented at the same time. The said control method's flow chart is shown in FIG. 1, which comprises steps of:

[0059]S0. Start the laser treatment device;

[0060]S1. A camera collects a fundus image;

[0061]S2 Recognize a macular area on the fundus image

[0062]S3. A control system monitors the movement of the laser spot on the fundus image

[0063]S4. Stop excitation of the laser treatment device when the laser spot irradiates onto the macular area, start excitation of the laser treatment device when the laser spot leaves the macular area.

[0064]During the auto-recognition process of the fundus image, the image of retina read by a camera or a photographic camera of the laser treatment dev...

embodiment 2

[0073]The second embodiment has a same basic control procedure as the first embodiment, with a main difference at step S3. The step S3 of the said second embodiment discloses an improvement of the image surveillance technique known in the art. The second embodiment shown in FIG. 7 comprises steps of:

[0074]S31 Collect image which contains the position of the laser spot on the fundus;

[0075]S32 Recognize the position of the laser spot

[0076]S33 Perform a superimposed-contrast between the image which the laser spot position has been recognized and the image which the macular area has been recognized in step S2, and judge whether there is a superimposition of the spot and the macular area. If there is a superimposition, it will judge that the spot irradiates onto the macular area, otherwise, it will judge that the spot doesn't irradiate onto the macular area.

[0077]Repeat steps from S31 to S33 in high frequency.

[0078]In order to further secure the safety of operation, the sampling time int...

embodiment 3

[0079]The third embodiment has a same basic control procedure as the first embodiment, with a main difference at step S3. The step S3 of the said third embodiment discloses an improvement of the image surveillance technique known in the art. The third embodiment shown in FIG. 8 comprises steps of:

[0080]S310 Continuously collect images which contain the position of the laser spot on the fundus;

[0081]S320 Recognize positions of the laser spot on continuous images, to form a trajectory of the laser spot;

[0082]S330 Predict the position of the laser spot on the next fundus image based on the said trajectory;

[0083]S340 Judge whether the said position of the laser spot enters the recognized macular area. If it enters the recognized macular area, it will judge that the spot irradiates onto the macular area, otherwise, it will judge that the spot doesn't irradiate onto the macular area.

[0084]Repeat steps from S310 to S340 in high frequency.

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PUM

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Abstract

A macular sparing control method and control system for an ophthalmic laser treatment device. The method comprises: during fundus treatment by using a laser treatment device, automatically controlling a switch of the laser treatment device by using a control system; when a laser spot irradiates onto a macular area, stopping excitation of the laser treatment device; and when the laser spot leaves the macular area, starting excitation of the laser treatment device. Damages to macula lutea can be effectively avoided by designing a macular sparing system for laser treatment and another field. During a surgical operation, a surgeon can focus on treatment of an affected part without considering the problem of safety, operation can be performed more efficiently and boldly, and accordingly, the operation efficiency is increased, more comprehensive treatment is realized, and pain of a patient can be relieved to a maximum extent.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a bypass Continuation of co-pending Application No. PCT / CN2013 / 078966, filed on Jul. 8, 2013, for which priority is claimed under 35 U.S.C. §120; and this application claims priority of Application No. 201310200771.0_filed in China on May 25, 2013 under 35 U.S.C. §119, the entire contents of all of which are hereby incorporated by reference.FIELD OF THE INVENTION[0002]The present invention relates to the field of ophthalmic laser therapy equipment, which more specifically is a macular sparing control method and control system for ophthalmic laser treatment device with high safety.DESCRIPTION OF RELATED ART[0003]As shown in FIG. 2, an anatomy of normal fundus mainly contains optic papilla, macula lutea, optic disc, retinal blood vessels system, etc. Optic papilla is made up of optic nerve fibers which is the part of the optic nerve goes through the wall of eyeball. Optic papilla generally appears orange. A sunken part w...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61F9/008
CPCA61F2009/00863A61F9/008
Inventor SONG, YANPINGCHEN, ZHONGSHANDING, QINYAN, MINGZHOU, DAOYU
Owner ZHOU DAOYU